Amity — Whenever you attack with Burning Celestial and exactly one other creature, Burning Celestial acclimates.
As long as you control a red Weather, Burning Celestial has trample.

Counter all other spells. Exile up to one spell countered this way instead of putting it into its owner's graveyard. You may cast that spell for as long as it remains exiled, and mana of any type can be spent to cast it.

Amity — Whenever you attack with Calming Celestial and exactly one other creature, Calming Celestial acclimates.
As long as you control a blue Weather, Calming Celestial has flying.

Trample
When Canopy Creeper enters, create two Berry tokens.

When Capricious Cat enters, it acclimates twice.

Once each turn, when Carefree Kappa enters or becomes the target of a spell or ability, you may create a Weather enchantment token that's all colors named Looks Like Rain with “Whenever you attack, you gain 1 life.”
Carefree Kappa gets +1/+1 for each Weather you control.

When this enchantment enters and whenever you draw your second card each turn, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Cycling {G}

Wander {2}{W}{W}
[–1]: Create your choice of a 1/1 white Bird creature token with flying or a 2/2 black Cat creature token.
[–2]: If a permanent entering the battlefield under your control this turn causes an ability of a permanent you control to trigger, that ability triggers an additional time.
[–3]: Put a +1/+1 counter on each creature you control.

Create a token that's a copy of target creature, except it's 3/3.

At the beginning of your end step, for each opponent with an even number of cards in hand, they lose 3 life and you gain 3 life.
[+1]: Target player draws a card and loses 1 life.
[–4]: Target opponent exiles one or more cards from their hand. Then you may have that player exchange their hand and the exiled cards.

Trample
When Centaur Mentor enters, target creature gets +X/+0 until end of turn, where X is your devotion to green.

{W}, Exile an artifact or enchantment card from your graveyard: You gain 3 life.
{2}{U}, Exile an instant or sorcery card from your graveyard: Draw a card.
{4}{B}, Exile a creature or planeswalker card from your graveyard: Create a tapped 0/0 colorless Robot artifact creature token with three +1/+1 counters on it.

Flying, haste
When Chainbreaker's Familiar enters, exile target instant or sorcery card from your graveyard. You may cast a copy of that card until the end of your next turn.
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, you may return Chainbreaker's Familiar from your graveyard to your hand.

If you would create one or more artifact tokens, instead create those tokens plus an additional Treasure token.
{2}{R}, Sacrifice X artifacts: This creature gets +X/+0 until end of turn.

Menace
When Chomei enters, create a tapped Treasure token.
Whenever you sacrifice a permanent, you may pay {1}. If you do, draw a card.

First strike
When Chosen of Heliod enters, bless target creature.
{4}{W}{W}: Bless target creature you control. Activate only as a sorcery.

Choose one. If this spell's flashback cost was paid, instead choose three and you may choose the same mode more than once.
• Create three 1/1 white Human creature tokens.
• Put a +1/+1 counter on each creature you control.
• Exile target nonland permanent until you control no creatures.
Flashback {6}{W}{W}

Choose one. If this spell's flashback cost was paid, instead choose three and you may choose the same mode more than once.
• Target player sacrifices a creature and a planeswalker.
• Target player discards two cards, then exiles their graveyard.
• All creatures get -2/-2 until end of turn.
Flashback {7}{B}{B}

Whenever you cast a spell from your graveyard, each opponent loses 1 life and you gain 1 life.
Surface {3}{B}{B}. Chum Chaser surfaces transformed.

Flying
When Civic Copterist enters, teach target creature flying.

This spell costs {2} less to cast if the creature you control it targets has power 4 or greater.
Put a +1/+1 counter on target creature you control. It deals damage to another target creature equal to its power.

When Codename: Spyder enters, mill three cards.
Whenever one or more cards are put into your graveyard from your library, you may return up to one of those cards to your hand. Do this only once each turn.

This spell costs {1} less to cast for each creature you control.
Create X 1/1 white Citizen creature tokens.

Damned — When this creature enters, mill three cards. If you've sacrificed a permanent this turn, you may return one of the milled cards to your hand.

Whenever an opponent loses life for the first time each turn, they lose 3 life.
Whenever an opponent discards a card for the first time each turn, they discard a card.
Whenever an opponent sacrifices a permanent for the first time each turn, they sacrifice a nonland permanent.